Effect of Thickness on Mechanically Tunable Magnetic Anisotropy of FeGa Thin Films Deposited on Flexible Substrates

2015 ◽  
Vol 815 ◽  
pp. 227-232 ◽  
Author(s):  
Ying Yu ◽  
Shu Hong Xie ◽  
Qing Feng Zhan
Keyword(s):  
Thin Films ◽  
Magnetic Properties ◽  
Magnetic Anisotropy ◽  
Effective Strain ◽  
Anisotropy Field ◽  
Saturation Field ◽  
Effective Anisotropy ◽  
Magnetostriction Constant ◽  
The Difference ◽  
Different Strains

A practical way to manipulate the magnetic anisotropy of magnetostrictive FeGa thin films grown on flexible polyethylene terephthalate (PET) substrates is introduced in this study. The effect of film thickness on magnetic properties and magnetostriction constant of polycrystalline FeGa thin films was investigated. The anisotropy field Hk of flexible FeGa films, i.e., the saturation field determined by fitting the hysteresis curves measured along the hard axis, was enhanced with increasing the tensile strain applied along the easy axis of the thin films, but this enhancement via strain became unconspicuous with increasing the thickness of FeGa films. In order to study the magnetic sensitivity of thin films responding to the external stress, we applied different strains on these films and measure the corresponding anisotropy field. Moreover, the effective magnetostriction constant of FeGa films was calculated from the changes of both anisotropy field and external strain based on the Villari effect. A Neel’s phenomenological model was developed to illustrate that the effective anisotropy field of FeGa thin films was contributed from both the constant volume term and the inverse thickness dependent surface term. Therefore, the magnetic properties for the volume and surface of FeGa thin films were different, which has been verified in this work by using vibrating sample magnetometer (VSM) and magneto-optic Kerr effect (MOKE) system. The anisotropy field contributed by the surface of FeGa film and obtained by MOKE is smaller than that contributed by the film volume and measured by VSM. We ascribed the difference in Hk to the relaxation of the effective strain applied on the films with increasing the thickness of films.

PHASE EVOLUTION AND MAGNETIC PROPERTIES OF TbCu7-TYPE (Sm, Pr)Co7-xHfxMy (x = 0-0.5; y = 0-0.14) RIBBONS

2009 ◽  
Vol 23 (06n07) ◽  
pp. 1663-1669 ◽  
Author(s):  
H. W. Chang ◽  
S. T. Huang ◽  
I. W. Chen ◽  
C. W. Chang ◽  
W. C. Chang
Keyword(s):  
Magnetic Properties ◽  
Magnetic Anisotropy ◽  
Exchange Coupling ◽  
Coupling Effect ◽  
Anisotropy Field ◽  
Phase Evolution ◽  
Phase Constitution ◽  
Melt Spun

The effects of Hf substitution and C content on the magnetic properties, phase evolution, and microstructure of melt spun ( Sm , Pr ) Co 7- x Hf x C y ( x = 0-0.5; y = 0-0.14) ribbons have been studied. A proper Hf substitution is helpful not only in stabilizing 1:7 phase but also in enhancing its magnetic anisotropy field. As a result, magnetic properties of B r = 6.4 kG , i H c = 7.3 kOe and ( BH ) max = 8.7 MGOe for SmCo 6.9 Hf 0.1 ribbons are obtained. Besides, a small amount of C addition in the ribbons could slightly modify phase constitution and effectively refine their microstructure to strengthen the exchange coupling effect between magnetic grains. Furthermore, a slight Pr substitution for Sm may further increase the magnetization and the magnetic properties of the ribbons. The optimal magnetic properties of B r = 7.1 kG , i H c = 8.5 kOe and ( BH ) max = 11.2 MGOe could be achieved for the directly quenched Sm 0.8 Pr 0.2 Co 6.9 Hf 0.1 C 0.12 ribbons.

Effect of Stress-induced Magnetic Anisotropy on the Properties of Giant Magnetostrictive Single Layer and Multilayer Thin Films

2004 ◽  
Vol 855 ◽  
Author(s):  
J. H. Tan ◽  
V. H. Guerrero ◽  
R. C. Wetherhold ◽  
W. A. Anderson
Keyword(s):  
Thin Films ◽  
Magnetic Properties ◽  
Magnetic Anisotropy ◽  
Rf Sputtering ◽  
Single Layer ◽  
Annealing Treatment ◽  
Deposition Process ◽  
Vacuum System ◽  
Internal Stresses ◽  
Sensors And Actuators

ABSTRACTGiant magnetostrictive thin films deposited on nonmagnetic substrates can constitute effective sensors and actuators for microdevices. In this work, we investigated the effects of a stress-induced anisotropy on the magnetic properties of Tb0.4Fe0.6, Fe0.5Co0.5 single layer films and [Tb0.4Fe0.6/Fe0.5Co0.5]n multilayers deposited on Si substrates. The magnetostrictive thin films were fabricated by means of RF sputtering and were subjected to a post-deposition annealing treatment. The uniaxial magnetic anisotropy was induced by bending the substrate before deposition and then allowing it to resume its original flat shape after depositing the film. The heat treatment was performed in a vacuum system with a vacuum of 10−6 Torr. The magnetic properties of the fabricated specimens were measured using a SQUID. SEM and XRD analyses were performed to ensure that the thermal treatment would relax the internal stresses induced during the deposition process without crystallizing the film. The thickness of the single layer thin films studied was between 300 and 800 nm while multilayer samples consisted of 6 layers with each layer thickness ranged from about 20 to 40 nm. Compared to single layer samples, multilayer samples with stress anneal growth exhibited an improvement in magnetic saturation by a factor of two while maintaining a low coercive field. Manipulations of the magnitude and direction of magnetic anisotropy was observed by introducing various values of tensile and compressive stress into the film.

EFFECT OF THICKNESS ON THE STRUCTURAL, MICROSTRUCTURAL, ELECTRICAL AND MAGNETIC PROPERTIES OF Ni FILMS ELABORATED BY PULSED ELECTRODEPOSITION ON Si SUBSTRATE

2018 ◽  
Vol 25 (02) ◽  
pp. 1850058
Author(s):  
T. KACEL ◽  
A. GUITTOUM ◽  
M. HEMMOUS ◽  
E. DIRICAN ◽  
R. M. ÖKSÜZOGLU ◽  
...  
Keyword(s):  
Thin Films ◽  
Magnetic Properties ◽  
Electrical Resistivity ◽  
Rutherford Backscattering Spectrometry ◽  
Lattice Parameter ◽  
Anisotropy Constant ◽  
Saturation Field ◽  
Grain Sizes ◽  
Electrical And Magnetic Properties ◽  
Effective Anisotropy Constant

We have studied the effect of thickness on the structural, microstructural, electrical and magnetic properties of Ni films electrodeposited onto [Formula: see text]-Si (100) substrates. A series of Ni films have been prepared for different potentials ranging from [Formula: see text]1.6[Formula: see text]V to [Formula: see text]2.6[Formula: see text]V. Rutherford backscattering spectrometry (RBS), X-ray diffraction (XRD), four point probe technique, atomic force microscopy (AFM) and vibrating sample magnetometry (VSM) have been used to investigate the physical properties of elaborated Ni thin films. From the analysis of RBS spectra, we have extracted the films thickness [Formula: see text] ([Formula: see text] ranges from 83[Formula: see text]nm to 422[Formula: see text]nm). We found that the Ni thickness, [Formula: see text] (nm), linearly increases with the applied potential. The Ni thin films are polycrystalline and grow with the [Formula: see text] texture. The lattice parameter [Formula: see text] (Å) monotonously decreases with increasing thickness. However, a positive strain was noted indicating that all the samples are subjected to a tensile stress. The mean grain sizes [Formula: see text] (nm) and the strain [Formula: see text] decrease with increasing thickness. The electrical resistivity [Formula: see text] ([Formula: see text]cm) increases with [Formula: see text] for [Formula: see text] less than 328[Formula: see text]nm. The diffusion at the grain boundaries may be the important factor in the electrical resistivity. From AFM images, we have shown that the Ni surface roughness decreases with increasing thickness. The coercive field [Formula: see text], the squareness factor [Formula: see text], the saturation field [Formula: see text] and the effective anisotropy constant [Formula: see text] are investigated as a function of Ni thickness and grain sizes. The correlation between the magnetic and the structural properties is discussed.

Effect of the effective anisotropy field of soft layer on magnetic properties of soft/hard stacked media

2008 ◽  
Vol 320 (22) ◽  
pp. 3083-3087 ◽  
Author(s):  
Y. Wang ◽  
F.S. Li ◽  
J. Ariake ◽  
N. Honda ◽  
S. Ishio ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Anisotropy Field ◽  
Soft Layer ◽  
Effective Anisotropy

ELECTRONIC STRUCTURES AND REORIENTATION OF PERPENDICULAR MAGNETIC ANISOTROPY OF Co/Au(111) and Co/Pd(111)

2002 ◽  
Vol 09 (02) ◽  
pp. 865-869
Author(s):  
M. SAWADA ◽  
K. HAYASHI ◽  
A. KAKIZAKI
Keyword(s):  
Thin Films ◽  
Magnetic Properties ◽  
Binding Energy ◽  
Film Thickness ◽  
Magnetic Anisotropy ◽  
Photoelectron Spectroscopy ◽  
Electronic Structures ◽  
Perpendicular Magnetic Anisotropy ◽  
Magnetization Direction ◽  
Electronic And Magnetic Properties

We have investigated electronic and magnetic properties of Co thin films epitaxially grown on Au(111) and Pd(111) substrates by spin- and angle-resolved photoelectron spectroscopy. In the Co/Au(111) system, the magnetization direction of Co changes from perpendicular to parallel to the surface at about 6 ML. The origin of the reorientation is qualitatively explained by the increasing contribution of Co 3d orbitals perpendicular to the surface. In the Co/Pd(111) system, the reorientation of the magnetization direction occurs at about 4 ML, the origin of which is explained as being due to the contribution of the upper Λ3 band of Co with increase of film thickness as in the case of the Co/Au(111) system. The stronger hybridization between Co 3d and Pd 4d states in the Co/Pd(111) system causes larger binding energy shifts of the Λ3 states than in the Co/Au(111) system.

scholarly journals Optical Measurement of Magnetic Anisotropy Field in Nanostructured ferromagnetic Thin Films

2015 ◽  
Vol 20 (1) ◽  
pp. 8-10 ◽  
Author(s):  
Hyun-Seok Whang ◽  
Sang-Jun Yun ◽  
Joon Moon ◽  
Sug-Bong Choe
Keyword(s):  
Thin Films ◽  
Magnetic Anisotropy ◽  
Optical Measurement ◽  
Anisotropy Field ◽  
Ferromagnetic Thin Films

Soft Magnetic Properties of [Fe80Ni20-O/NiZn-Ferrite]n Multilayer Thin Films for High Frequency Application

2014 ◽  
Vol 488-489 ◽  
pp. 174-177
Author(s):  
Rui Xu ◽  
Lai Sen Wang ◽  
Xiao Long Liu ◽  
Meng Lei ◽  
Qing Luo ◽  
...  
Keyword(s):  
Thin Films ◽  
Magnetic Properties ◽  
Layer Thickness ◽  
High Frequency ◽  
Anisotropy Field ◽  
Soft Magnetic Properties ◽  
Multilayer Thin Films ◽  
Insulation Layer ◽  
Soft Magnetic ◽  
Measured Resistivity

In this research, a series of [Fe80Ni20-O/NiZn-ferritn multilayer thin films with different insulation layer thickness were prepared by magnetron sputtering at room temperature. The high frequency soft magnetic properties of [Fe80Ni20-O/NiZn-ferritn multilayer thin films were investigated. It was found that the in-plane magnetic anisotropy field (Hk) and saturation magnetizations (4πMs) can be adjusted by changing the insulation layer thickness, and the optimal Hk and 4πMs can be obtained as the insulation layer thickness of 2.5 nm. The adjustment of insulation layer thickness is essential to obtain low coercivity (Hc) and high permeability (μ) of the multilayer thin films. The measured resistivity (ρ) of [Fe80Ni20-O/NiZn-ferritn multilayer thin films was increased from 211 to 448 μΩcm with increasing the insulation layer thickness.

Magnetic Properties of Nanostructured Co-Based Alloys Produced by Dynamic Compaction and Plasma Spray Deposition

2012 ◽  
Vol 190 ◽  
pp. 192-195 ◽  
Author(s):  
L. Kuzovnikova ◽  
Elena A. Denisova ◽  
A. Kuzovnikov ◽  
Rauf S. Iskhakov ◽  
A. Lepeshev
Keyword(s):  
Magnetic Properties ◽  
Magnetic Anisotropy ◽  
Plasma Spray ◽  
Spray Deposition ◽  
Anisotropy Field ◽  
Dynamic Compaction ◽  
Magnetic Characteristics ◽  
Bloch Constant ◽  
Deposition Techniques ◽  
Ferromagnetic Resonance Linewidth

The bulk nanostructured Co-P alloys were prepared by dynamic compaction and a plasma spray deposition techniques. The magnetic characteristics, such as the saturation magnetization, M0, the Bloch constant, B, the local magnetic anisotropy field, Ha, the ferromagnetic resonance linewidth, ΔH, the coercivity, Hc, were investigated. A comparison between the magnetic properties of the Co-P alloys prepared by dynamic compaction and a plasma spray deposition techniques was carried out.

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